KR20200065973A - Wheel hub and wheel bearing assembly comprising same - Google Patents

Abstract

According to an embodiment of the present disclosure, a wheel hub includes: an inner hub part formed of a first material and having a central portion protruding in an inner axial direction and a flange portion extending in an outer radial direction from the central portion; and an outer hub part formed of a second material having a low strength and a small weight compared to the first material, and integrally coupled to the inner hub part. The flange portion has a plurality of fastening holes which are axially penetrated and spaced apart from each other in a circumferential direction to be fastened with a wheel, and includes a plurality of main extension parts protruding while extending along a plurality of virtual reference lines extending in the outer radial direction from an axis of rotation toward the position of each of the plurality of fastening holes. The outer hub part includes a circumferential part extending in the circumferential direction while connecting the plurality of main extension parts. Each of the main extension parts has a first circumferential direction boundary and a second circumferential direction boundary around the corresponding extending reference lines. The first circumferential direction boundary extends in the direction between an inner radial direction and a first circumferential direction, and the second circumferential direction boundary extends in the direction between the inner radial direction and a second circumferential direction. According to the present invention, the weight of a wheel bearing assembly can be reduced while the required strength in a design process is secured.

Description

Wheel hub and wheel bearing assembly including the same{WHEEL HUB AND WHEEL BEARING ASSEMBLY COMPRISING SAME}

The present disclosure relates to a wheel hub and a wheel bearing assembly comprising the same.

The wheel bearing assembly is a device mounted between the rotating and non-rotating elements of the vehicle body to facilitate rotation of the rotating elements. The wheel bearing assembly of the vehicle provides a function for moving the vehicle by rotatably connecting the wheel to the vehicle body. The wheel bearing assembly may be divided into a driving wheel wheel bearing assembly that transmits power generated in the engine and a driven wheel wheel bearing assembly that does not transmit driving force.

The drive wheel wheel bearing assembly includes a rotating element and a non-rotating element. The rotating element can be rotated together with the drive shaft by the torque generated by the engine and passing through the transmission. In contrast, the non-rotating element is fixed to the vehicle body, and a transmission device is interposed between the rotating element and the non-rotating element. The follower wheel bearing assembly includes a configuration similar to the drive wheel wheel bearing assembly, but, unlike the drive wheel wheel bearing assembly, the difference is that the rotating element is not connected to the drive shaft.

The conventional wheel bearing assembly occupies a considerable weight in the drive system of the vehicle, and it is necessary to reduce the weight of the wheel bearing assembly in order to increase driving efficiency. However, there is a problem in that it is difficult to achieve weight reduction of the wheel bearing assembly while securing the required strength in the design process. Embodiments of the present disclosure solve this problem.

In order to use a wheel hub to which a dissimilar material is applied for weight reduction of a wheel bearing assembly, it is necessary to secure a bonding force between dissimilar materials. Embodiments of the present disclosure provide an improved shaped wheel hub for improving physical bonding between dissimilar materials.

One aspect of the present disclosure provides embodiments of a wheel hub. A wheel hub according to an exemplary embodiment includes an inner hub portion formed of a first material and having a central portion protruding in an inner axial direction and a flange portion extending in an outer radial direction from the central portion; And an outer hub portion formed of a second material having a relatively low strength and a relatively small weight compared to the first material, and integrally coupled with the inner hub portion. The flange portion is formed to form a plurality of fastening holes which are axially penetrated and spaced apart from each other along the circumferential direction to be fastened with the wheel, and extend virtually outwardly from the rotational axis toward each position of the plurality of fastening holes. And a plurality of main extensions protruding along a plurality of extension reference lines. The outer hub portion includes a circumferential portion extending in a circumferential direction connecting the plurality of main extension portions. Each of the main extensions has a first circumferential boundary and a second circumferential boundary around the corresponding extension reference line. The first circumferential boundary extends in the direction between the inner radial direction and the first circumferential direction, and the second circumferential boundary extends in the direction between the inner radial direction and the second circumferential direction.

In embodiments, each of the fastening holes may be formed in the outer radial portion of the corresponding main extension.

In embodiments, the boundary of the first circumferential direction of each of the main extensions is in a direction closer to the vertical direction of the extension reference lines adjacent to the first circumferential direction than to the extension direction of the extension reference lines adjacent to the second circumferential direction. Can be extended. The boundary of the second circumferential direction of each of the main extensions may extend in a direction closer to the vertical direction of the extension reference line adjacent to the second circumferential direction than the extension direction of the extension reference line adjacent to the first circumferential direction.

In embodiments, in each of the main extensions, a boundary in the first circumferential direction forms a first angle with the extension reference line adjacent in a second circumferential direction, and a boundary in the second circumferential direction is a first circumference. A second angle may be formed with the extension reference line adjacent in the direction. The first angle and the second angle may be the same.

In embodiments, in each of the main extensions, a boundary in the first circumferential direction forms a first angle with the extension reference line adjacent in a second circumferential direction, and a boundary in the second circumferential direction is a first circumference. A second angle may be formed with the extension reference line adjacent in the direction. The first angle may be 10° or more and 60° or less. The second angle may be 10° or more and 60° or less.

In embodiments, in each of the main extensions, a virtual extension line extending along the first circumferential boundary and a virtual extension line extending along the second circumferential boundary are outside radii of the outer hub portion. You can cross outside the direction.

In embodiments, the flange portion, the outer radial end surface and the inner axial end surface is located in the connecting portion, the inner radial direction and the inner axial direction includes a locking portion forming a surface with a slope in the direction between You can. The outer hub portion may cover the outer radial portion of the outer axial surface of the flange portion and the engaging portion.

In embodiments, the angle between the axial direction and the inclined direction of the locking portion may be 1° or more and 45° or less.

In embodiments, the axial length of the engaging portion may be longer than the radial length.

In embodiments, the axial length of the engaging portion may be 1/3 or more of the axial width of the flange portion.

In embodiments, the flange portion, the first stepped surface spaced in the inner radial direction from the outer radial end surface and connected to the inner axial end surface, the outer axial direction spaced apart from the inner axial end surface and It may include a locking portion including an outer radial end surface and a second step surface connected to the first step surface. The outer hub portion may cover the outer radial portion of the outer axial surface of the flange portion, the first stepped surface, and the second stepped surface.

In embodiments, the second stepped surface may include: a recessed curved surface extending in an outer radial direction from an outer axial end of the first stepped surface; And a convex curved surface extending round in the inner radial direction from the inner axial end of the outer radial end surface.

In embodiments, the second stepped surface may further include a flat surface extending between the recessed curved surface and the convex curved surface.

In embodiments, the first stepped surface may include a surface having a slope in a direction between an inner radial direction and an inner axial direction.

In embodiments, the outer hub portion covers a plurality of outer axial surfaces of the plurality of main extensions, and passes through axially at positions corresponding to the plurality of fastening holes to be connected to the fastening holes. Can form. The diameter of the corresponding hole may be the smallest at the inner axial end of the corresponding hole. The diameter at the inner axial end of the corresponding hole may be greater than or equal to the diameter at the outer axial end of the fastening hole.

In embodiments, the outer hub portion may include a chamfer portion configured to gradually increase in diameter toward the outer axial direction of the corresponding hole.

In embodiments, the inner hub portion may include a plurality of rigid reinforcing portions protruding in the outer axial direction and extending in a radial direction. The outer hub portion may cover the outer axial surface of the inner hub portion. The plurality of rigid reinforcement parts may include a plurality of first rigid reinforcement parts extending in an inner radial direction from the positions of the plurality of fastening holes. The number of the plurality of rigid reinforcement parts may be the same as the number of the plurality of main extension parts, or may be the same as a multiple of the number of the plurality of main extension parts.

In embodiments, the circumferential distal end of each surface of the rigid reinforcement may be roundly connected to the surface of the other portion of the inner hub.

In embodiments, the circumferential center portion of each surface of the rigid reinforcement may be flat in the direction perpendicular to the outer axial direction, or protrude roundly in the outer axial direction.

In embodiments, the plurality of rigid reinforcement parts may include a plurality of second rigid reinforcement parts disposed between the plurality of first rigid reinforcement parts.

In embodiments, a circumferential width may be reduced in shape toward the inner axial direction.

Another aspect of the present disclosure provides embodiments of a wheel bearing assembly. Wheel bearing assembly according to a representative embodiment, the outer ring; A wheel hub rotatable relative to the outer ring and configured to rotate integrally with the wheel; And a rolling member disposed between the outer ring and the wheel hub. The wheel hub includes an inner hub portion formed of a first material and having a central portion protruding in an inner axial direction and a flange portion extending radially outward from the central portion; And an outer hub portion formed of a second material having a relatively low strength and a relatively small weight compared to the first material, and integrally coupled with the inner hub portion. The flange portion forms a plurality of fastening holes which are axially penetrated and are spaced apart from each other along the circumferential direction to be fastened with the wheel, and extend in an outer radial direction from the rotating shaft toward each of the plurality of fastening holes. And a plurality of main extensions extending and protruding along a plurality of imaginary extension reference lines. The outer hub portion includes a circumferential portion extending in a circumferential direction connecting the plurality of main extension portions. Each of the main extensions has a first circumferential boundary and a second circumferential boundary around the corresponding extension reference line. The first circumferential boundary extends in the direction between the inner radial direction and the first circumferential direction, and the second circumferential boundary extends in the direction between the inner radial direction and the second circumferential direction.

According to embodiments of the present disclosure, by replacing the rest of the portion except for the stress concentration portion with a lightweight material, it is possible to secure design strength while reducing the weight of the wheel hub and the wheel bearing assembly.

According to embodiments of the present disclosure, a coupling force between the inner hub portion and the outer hub portion can be enhanced.

According to embodiments of the present disclosure, it is possible to improve the convenience of the bonding process of the inner hub portion and the outer hub portion.

According to embodiments of the present disclosure, stiffness for transmitting rotational force between the inner hub portion and the outer hub portion may be improved.

According to embodiments of the present disclosure, the possibility of occurrence of a phenomenon in which the fastening hole is damaged by a wheel bolt can be reduced.

1 is a cross-sectional view of a wheel bearing assembly 1 according to one embodiment of the present disclosure.
2 is a perspective view of the wheel hub 10 according to the embodiment of FIG. 1.
3 is a perspective view of the wheel hub 10 of FIG. 2 as viewed from another direction.
4 is a perspective view of the outer hub portion 200 partially cut away from the wheel hub 10 of FIG. 2.
5 is a cross-sectional view of the wheel hub 10 according to the embodiment of FIG. 1.
6 is an experimental result of measuring the stress received for each part when the integral wheel hub (HUB) formed of a single material rotates according to an experimental example.
7 is an elevational view of the inner axial direction IA of the wheel hub 10 of FIG. 2.
8 is an enlarged partial sectional view of part E1 of FIG. 5.
9 is an enlarged partial sectional view of part E2 of FIG. 5.
10 is a perspective view of an inner hub portion 100 ′ according to another embodiment of the present disclosure.
FIG. 11 is a partial cross-sectional view of the inner hub portion 100 ′ of FIG. 10 cut along the E3 portion of FIG. 10 in a state in which it is combined with the outer hub portion 200 ′.
FIG. 12 is a partial cross-sectional view of the inner hub portion 100 ′ of FIG. 10 cut along the E4 portion of FIG. 10 in a state where the outer hub portion 200 ′ is coupled.
13 is a partial cross-sectional view showing an inner hub portion 100 ″ and an outer hub portion 200 ″ according to another embodiment in FIG. 11.
14 is a partial cross-sectional view showing an inner hub portion 100 ″ and an outer hub portion 200 ″ according to another embodiment in FIG. 12.
15 is a perspective view showing an outer axial (OA) surface of the inner hub portion 100 of FIG. 2, and the rigid reinforcement 150 according to an embodiment is illustrated.
16 is a perspective view showing an outer axial (OA) surface of the inner hub portion 100 of FIG. 2, and a rigid reinforcement 150 ′ according to another embodiment is illustrated.
FIG. 17 is a cross-sectional view of the inner hub portion 100 of FIG. 15 taken along the line S1-S1', and the rigid reinforcement portion 150S1 according to the first embodiment is shown.
18 is a cross-sectional view of the inner hub portion 100 of FIG. 15 taken along the line S1-S1', and the rigid reinforcement portion 150S2 according to the second embodiment is shown.

The embodiments of the present disclosure are exemplified for the purpose of illustrating the technical spirit of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments presented below or the specific description of these embodiments.

All technical and scientific terms used in the present disclosure, unless defined otherwise, have meanings generally understood by those of ordinary skill in the art to which this disclosure belongs. All terms used in the present disclosure are selected for the purpose of more clearly describing the present disclosure and are not selected to limit the scope of the rights according to the present disclosure.

As used in this disclosure, expressions such as “comprising”, “having”, “having”, and the like, are open terms that imply the possibility of including other embodiments, unless stated otherwise in the phrase or sentence in which the expression is included. (open-ended terms).

The expressions of the singular forms described in this disclosure may include the meaning of the plural forms unless otherwise stated, and the same applies to the expressions of the singular forms described in the claims.

Expressions such as “first” and “second” used in the present disclosure are used to distinguish a plurality of components from each other, and do not limit the order or importance of the components.

The dimensions and values described in the present disclosure are not limited to the dimensions and values described. Unless otherwise specified, these dimensions and values can be understood to mean the stated values and equivalent ranges including them. For example, a dimension of '45°' described in this disclosure can be understood to include'about 45°'.

As used in the present disclosure, the “direction in the radial direction” refers to a radial direction with respect to the axis of rotation of the rotating body, and the “direction in the radial direction” refers to a radial direction with respect to the axis of rotation of the rotating body. ), the direction away from the axis, and the direction directive of "inner radial direction" means the opposite direction of the outer radial direction. In addition, the "direction direction" of the "axial direction" used in the present disclosure means a direction parallel to the rotation axis of the rotating body, and the "direction of the outer axial direction" indicates the direction toward the outside of the vehicle body along the rotation axis of the rotating body. Meaning, the "direction in the inner axial direction" means the direction toward the inside of the vehicle body along the rotation axis of the rotating body. In addition, the "direction in the circumferential direction" used in the present disclosure refers to a direction that rotates around the rotation axis of the rotating body, and the "first circumferential direction" direction indicators are clockwise and counterclockwise in the circumferential direction. One direction, and the direction directive of the "second circumferential direction" means the opposite direction of the first circumferential direction. In the drawings, the rotation axis (C) of the rotating body, the outer radial direction (OR), the inner radial direction (IR), the outer axial direction (OA), the inner axial direction (IA), the first circumferential direction (C1) and the second circumference The direction C2 is shown.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are given the same reference numerals. In addition, in the following description of the embodiments, the same or corresponding elements may be omitted. However, although descriptions of components are omitted, it is not intended that such components are not included in any embodiment.

1 is a cross-sectional view of a wheel bearing assembly 1 according to one embodiment of the present disclosure. Referring to FIG. 1, the wheel bearing assembly 1 includes an outer ring 20 fixed to a vehicle body and inner ring portions 10 and 15 configured to be rotatable relative to the outer ring 20. The outer ring 20 supports the inner ring portions 10 and 15 so as to be capable of relative rotation.

The outer ring 20 is coupled to the knuckle 50. The outer ring 20 includes a flange (not shown) protruding in the outer radial direction (OR). The outer ring 20 and the knuckle 50 may be coupled via a knuckle bolt 66 penetrating the flange of the outer ring 20 in the axial direction (OA, IA).

The inner ring portions 10, 15 are configured to rotate integrally with the wheel. The inner ring portions 10 and 15 include a wheel hub 10 and an inner ring 15, but in another embodiment, not shown, the inner ring portion may be composed of only the wheel hub 10. Hereinafter, description will be given based on the inner ring portions 10 and 15 of this embodiment. The inner ring 15 is pressed onto the outer circumferential surface of the wheel hub 10. The inner ring 15 rotates integrally with the wheel hub 10.

The wheel hub 10 is configured to be rotatable relative to the outer ring 20. The wheel hub 10 is configured to rotate integrally with the wheel. The wheel is coupled to the wheel hub 10, and the wheel hub 10 and the wheel rotate integrally. The wheel hub 10 has a flange protruding in the outer radial direction (OR). The wheel hub 10 and the wheel may be coupled via a wheel bolt 61 penetrating the flange of the wheel hub 10 in the axial direction (OA, IA).

The wheel hub 10 includes an inner hub portion 200 disposed in an inner axial direction IA and an outer hub portion 200 coupled in an outer axial direction OA of the inner hub portion 100. The inner hub portion 100 and the outer hub portion 200 rotate integrally.

In the present disclosure, that the first component "rotates in one piece" with the second component means that the first component rotates in the same rotational speed and the same rotational speed as the second component.

The wheel bearing assembly 1 includes a rolling member 30 disposed between the outer ring 20 and the inner ring portions 10, 15. The rolling member 30 is disposed between the outer circumferential surface of the inner ring portions 10 and 15 and the inner circumferential surface of the outer ring 20. The rolling member 30 is disposed between the outer ring 20 and the wheel hub 10.

The rolling member 30 may include a plurality of rolling elements 31 disposed between the outer circumferential surface of the wheel hub 10 and the inner circumferential surface of the outer ring 20 opposed thereto. In addition, the rolling member 30 may include a plurality of rolling elements 31 disposed between the outer circumferential surface of the inner ring 15 and the inner circumferential surface of the outer ring 20 opposed thereto.

In the present embodiment, the plurality of rolling elements 31 are arranged in two rows at predetermined intervals in the axial direction (OA, IA), but the number of rows in the axial direction (OA, IA) of the plurality of rolling elements 31 is accordingly It is not limited, and the plurality of rolling elements 31 may be arranged in one row or three or more rows. In addition, although the plurality of rolling elements 31 are shown as ball bearings in this embodiment, the plurality of rolling elements 31 may be formed of roller bearings, tapered roller bearings, needle bearings, and the like. Further, in the present embodiment, the plurality of rolling elements 31 is formed of a metal material, but the plurality of rolling elements 31 may be formed of various materials such as plastic.

The plurality of rolling elements 31 arranged in each row are arranged in the circumferential direction around the rotation axis C. The rolling member 30 may include a retainer 36 (retainer) for maintaining a plurality of rolling elements 31 at regular intervals along the circumferential direction. The retainer 36 constrains the positions of the plurality of rolling elements 31. The retainer 36 is located between the outer ring 20 and the inner ring portions 10, 15.

2 is a perspective view of the wheel hub 10 according to the embodiment of FIG. 1. 3 is a perspective view of the wheel hub 10 of FIG. 2 as viewed from another direction. 2 and 3, holes 120h and 230h penetrating the inner hub portion 100 and the outer hub portion 200 may be formed in the wheel hub 10. The fastening hole 120h of the inner hub portion 100 and the corresponding hole 230h of the outer hub portion 200 are connected to form holes 120h and 230h of the wheel hub 10. The wheel bolt 61 passes through the holes 120h and 230h and is fixed to the wheel hub 10.

The inner hub portion 100 is disposed toward the inner axial direction IA with respect to the outer hub portion 200. The outer hub part 200 covers the outer axial surface of the inner hub part. The outer hub part 200 is disposed toward the wheel based on the inner hub part 100.

The wheel hub 10 may be composed of at least two different materials. The inner hub portion 100 and the outer hub portion 200 may be made of different materials.

The inner hub portion 100 is formed of a first material. For example, the first material may be a steel material.

The inner hub portion 100 includes a central portion 110 protruding in the inner axial direction (IA). The central portion 110 protrudes from the center of the flange portion 120. The outer circumferential surface of the central portion 110 faces the inner circumferential surface of the outer ring 20. The rolling member 30 is positioned between the central portion 110 and the outer ring 20. The surface of the outer axial direction OA of the central portion 110 forms a groove recessed in the inner axial direction IA. The inner circumferential surface of the central portion 110 is covered by the outer hub portion 200. The central portion 110 is covered by the central cover portion 213 of the outer hub portion 200.

The inner hub portion 100 includes a flange portion 120 extending in the outer radial direction (OR) from the central portion 110. The flange portion 120 is formed radially around the rotation axis (C). The flange portion 120 may be formed in a plate shape having a thickness in the axial direction (OA, IA). The surface of the outer axial direction OA of the flange portion 120 is covered by the outer hub portion 200. The surface of the outer axial direction OA of the flange portion 120 is covered by the outer cover portion 232 of the outer hub portion 200.

The flange portion 120 forms a fastening hole (120h) through the axial direction (OA, IA) to be fastened with the wheel. The plurality of fastening holes 120h are spaced apart from each other along the circumferential directions C1 and C2. The plurality of fastening holes 120h may be arranged spaced apart from each other in the circumferential directions C1 and C2.

The flange portion 120 includes a plurality of main extensions 121 extending in the outer radial direction OR toward the respective positions of the plurality of fastening holes 120h from the rotation axis C. The main extension part 121 is formed to protrude in the outer radial direction (OR).

The flange portion 120 includes an auxiliary extension portion 122 positioned between two adjacent main extension portions 121 in the circumferential directions C1 and C2. The plurality of auxiliary extensions 122 and the plurality of main extensions 121 are alternately arranged one by one in the circumferential direction. The auxiliary extension 122 protrudes shorter in the outer radial direction OR than the main extension 121. The main extension part 121 and the auxiliary extension part 122 are connected to each other and are integrally formed.

The plurality of fastening holes 120h are formed to correspond to the plurality of main extensions 121 of the flange portion 120. The number of the plurality of fastening holes 120h and the number of the plurality of main extension parts 121 may be the same. That is, the plurality of fastening holes 120h may correspond one-to-one to the plurality of main extensions 121.

Each fastening hole (120h) is formed in the outer radial (OR) portion of the corresponding main extension (121). The fastening hole 120h is formed at a position closer to the end of the outer radial direction OR than the end of the inner radial direction IR of the corresponding main extension 121.

The outer hub part 200 is formed of a second material different from the first material. The second material is a material having a relatively low strength and a relatively small weight compared to the first material.

For example, the second material may be a lightweight alloy material. The lightweight alloy material may be composed of an alloy including one or more of aluminum, magnesium, titanium, or a combination thereof.

When the second material is a lightweight alloy material, the inner hub portion 100 and the outer hub portion 200 may be integrally formed by a cold forging method, a warm forging method, or a hot forging method. For example, in the case of the hot forging method, the inner hub portion 100 is first manufactured from the first material, and the inner hub portion 100 is in a mold having an inner shape corresponding to the outer shape of the outer hub portion 200. And the second material preform (temporarily manufactured forged object to form an outer hub part) is disposed, and then the inner hub part 100 and the preform are hot formed in a high temperature and high pressure environment to form a wheel hub 10 ) Can be prepared.

Alternatively, the inner hub portion 100 and the outer hub portion 200 may be formed in a semi-melting forging method. The semi-melt forging method may refer to a method in which a forged object is compressed in a semi-melted state after being heated in a semi-melted state, rather than a method in which the object is compressed in a complete liquid or a complete solid state. Here, the semi-melted state of the forged object may mean a state in which a part of the forged object is melted, that is, an intermediate state between a liquid and a solid as the object is heated to a temperature above a certain level. Under this semi-melting method, the inner hub portion 100 and the outer hub portion 200 may be integrally formed by being compressed in a semi-melting state after being heated to a temperature above a certain level, respectively. The forging method can be advantageous in that the process is simpler and less expensive than other methods.

As another example, the second material may include CFRP (Carbon Fiber Reinforced Plastics). For example, by combining the manufactured inner hub portion 100 and a hot press mold, by inserting a carbon chip containing CFRP into the hot press mold and using a hot press method, the inner hub portion The outer hub portion 200 integrally coupled with the 100 may be formed.

As another example, an adhesive means such as an adhesive or a brazing filler metal is applied between the inner hub portion 100 and the outer hub portion 200, so that the inner hub portion 100 and the outer hub portion 200 are each other. Can be combined. The bonding means may be further used in combination with the other bonding methods described above.

Through the above-described method, the outer hub part 200 is integrally coupled with the inner hub part 100. After the inner hub portion 100 and the outer hub portion 200 are integrally formed, holes 120h and 230h for insertion of the wheel bolts 61 may be formed at one time by a hole forming device (not shown) such as a drill. Can be. That is, the fastening hole 120h of the inner hub portion 100 and the corresponding hole 230h of the outer hub portion 200 are not formed, but may be formed at a time through one process. According to this configuration, the fastening hole 120h of the inner hub portion 100 and the corresponding hole 230h of the outer hub portion 200 may be exactly matched.

The outer hub part 200 includes a central counterpart 210 positioned at the center of the outer hub part 200. The central counter portion 210 is formed at a position corresponding to the central portion 110 of the inner hub portion 100. The central counterpart 210 covers the inner circumferential surface of the central portion 110 of the inner hub portion 100.

The outer hub part 200 includes a circumferential part 230 that extends while connecting a plurality of main extension parts 121 in the circumferential directions C1 and C2. The circumferential portion 230 may form a circle around the rotation axis C when viewed in the axial directions OA and IA. The circumferential portion 230 protrudes from the central counterpart 210 in the outer radial direction OR and extends in the circumferential directions C1 and C2. The circumferential portion 230 covers the surface of the outer axial direction OA of the flange portion 120 of the inner hub portion 100.

The circumferential portion 230 forms a corresponding hole 230h penetrated in the axial direction (OA, IA) to be engaged with the wheel. The plurality of corresponding holes 230h are spaced apart from each other along the circumferential directions C1 and C2. The plurality of corresponding holes 230h may be arranged to be spaced apart from each other in the circumferential directions C1 and C2.

The plurality of corresponding holes 230h are formed to correspond to the plurality of fastening holes 120h. The number of the plurality of corresponding holes 230h and the number of the plurality of fastening holes 120h may be the same. That is, the plurality of corresponding holes 230h may correspond one-to-one to the plurality of fastening holes 120h. The plurality of corresponding holes 230h are penetrated in the axial direction (OA, IA) at positions corresponding to the plurality of fastening holes 120h to be connected to the fastening holes 120h.

The circumferential portion 230 includes a circumferential extension portion 231 filling a gap between two adjacent main extension portions 121 in the circumferential directions C1 and C2. The circumferential extensions 231 extend in the circumferential directions C1 and C2 to connect two adjacent main extensions 121 in the circumferential directions C1 and C2 to each other.

4 is a perspective view of the outer hub portion 200 partially cut away from the wheel hub 10 of FIG. 2. 5 is a cross-sectional view of the wheel hub 10 according to the embodiment of FIG. 1. 4 and 5, the inner hub portion 100 includes a locking portion 126 on which the outer hub portion 200 is locked. Through the engaging portion 126, the bonding force of the inner hub portion 100 and the outer hub portion 200 in the axial direction (OA, IA) can be further improved.

The engaging portion 126 is formed at the boundary portion of the outer radial direction OR of the inner hub portion 100. In the boundary portion of the outer radial direction OR of the flange portion 120, the end portion of the inner axial direction IA is recessed in the inner radial direction IR compared to the end portion of the outer axial direction OA, so that the locking portion 126 Is formed.

The locking portion 126 may extend along the boundary of the outer radial direction OR of the flange portion 120. The locking portion 126 may include a first locking portion 126a positioned at a boundary portion of the outer radial direction OR of the main extension portion 121. The locking portion 126 may include a second locking portion 126b positioned at the boundary portion of the outer radial direction OR of the auxiliary extension portion 121. The first locking portion 126a and the second locking portion 126b are alternately arranged alternately along the circumferential directions C1 and C2.

The outer hub part 200 covers the surface of the outer radial direction OR of the locking part 126. For example, through the forging method described above, the forged object is pushed into the space between the surface of the outer radial direction (OR) of the engaging portion 126 and the inner surface of the mold, so that the outer radius of the outer hub portion 200 The end portion of the direction OR may be formed to cover the locking portion 126.

The circumferential portion 230 of the outer hub portion 200 includes a locking counter portion 235 that covers the outer radial portion of the surface of the outer axial direction OA of the flange portion 120. The engaging counterpart 235 covers the surface of the outer radial direction OR of the flange portion 120. The catch correspondence part 235 covers the catch part 126 of the flange part 120. Specifically, the engaging counterpart 235 continuously surrounds and covers the outer radial portion of the surface of the outer axial direction OA of the flange portion 120 and the engaging portion 126. The catching correspondence unit 235 includes a first catching correspondence part 235a covering the first catching part 126a and a second catching correspondence part 235b covering the second catching part 126b.

The circumferential portion 230 of the outer hub portion 200 includes an outer cover portion 232 connected to the circumferential extension portion 231. The outer hub part 200 covers the surfaces of the outer axial direction OA of the plurality of main extension parts 121. The outer cover portion 232 includes a first outer cover portion 232a covering the surface of the outer axial direction OA of the main extension portion 121. The outer cover part 232 includes a second outer cover part 232b covering the surface of the outer axial direction OA of the auxiliary extension part 121.

The center corresponding portion 210 of the outer hub portion 200 includes a pilot portion 211 protruding in the outer axial direction (OA). The central counter portion 210 includes a central cover portion 213 covering the surface of the outer axial direction OA of the central portion 110 of the inner hub portion 100.

6 is an experimental result of measuring the stress received for each part when the integral wheel hub (HUB) formed of a single material rotates according to an experimental example. In one experimental example of FIG. 6, overall high stress is measured in the central portion around the rotational axis C of the wheel hub HUB. In addition, a relatively high stress is measured along the portion extending in the outer radial direction (OR) to the portion where the hole to which the wheel bolt is connected is formed in the central portion of the wheel hub (HUB), and in the circumferential directions (C1, C2). The relatively low stress is measured between the two adjacent holes. According to the results of these experiments, the boundary Lp between the portion where the stress is relatively concentrated and the portion that is not relatively is illustrated in FIG. 6. That is, the portion of the inner radial direction IR relative to the boundary Lp in the wheel hub HUB takes a relatively high stress, and the portion of the outer radial direction OR relative to the boundary Lp is relatively low. It takes stress.

In an embodiment of the present disclosure, along the shape of the boundary Lp of FIG. 6, the boundary of the outer radial direction OR of the flange portion 120 of the inner hub portion 100 formed of the first material is formed, The remaining portion is filled with the outer hub part 200 formed of the second material. Through this, while the wheel hub 10 is formed to be lightweight, the core portion for the strength of the wheel hub 10 can be made into the inner hub portion 100, thereby significantly improving structural efficiency.

7 is an elevational view of the inner axial direction IA of the wheel hub 10 of FIG. 2. Referring to FIG. 7, the boundary shape of the outer radial direction (OR) of the inner hub portion 100 according to the experimental results of FIG. 6 will be described in detail as follows.

By defining a plurality of virtual extension lines Ls extending in the outer radial direction OR toward the respective positions of the plurality of fastening holes 120h from the rotational axis C, the boundary shape of the inner hub portion 100 is described. can do. Here, the extended reference line Ls is an imaginary straight line and does not refer to an actual component. The plurality of extended reference lines Ls correspond one-to-one to the plurality of fastening holes 120h. One extending reference line (Ls) crosses the center of the corresponding fastening hole (120h) from the rotation axis (C) and extends in the outer radial direction (OR).

The plurality of main extensions 121 of the inner hub portion 100 extend and protrude in the outer radial direction OR along the plurality of extension reference lines Ls. The plurality of main extensions 121 correspond one-to-one to the plurality of extension reference lines Ls. In the embodiment of FIG. 7, five extended reference lines Ls1, Ls2, Ls3, Ls4, Ls5 corresponding to five fastening holes 120h are shown, and five extended reference lines Ls1, Ls2, Ls3, Ls4, Ls5 ), five main extensions 121-1, 121-2, 121-3, 121-4, and 121-5 are configured.

Each main extension part 121 forms a boundary 127 on both sides of the circumferential direction around the corresponding extension reference line Ls. Each main extension 121 has a boundary 127a in the first circumferential direction C1 and a boundary 127b in the second circumferential direction C2 around the corresponding extension reference line Ls.

The first circumferential boundary 127a extends in a direction between the inner radial direction IR and the first circumferential direction C1, and the second circumferential boundary 127b has an inner radial direction IR and a second It extends in the direction between the circumferential directions C2. The first circumferential boundary 127a may extend straight in a direction between the inner radial direction IR and the first circumferential direction C1. The second circumferential boundary 127b may extend straight in a direction between the inner radial direction IR and the second circumferential direction C2.

The end of the outer radial direction OR of the first circumferential boundary 127a is connected to the boundary 128 of the outer radial direction OR of the main extension 121. The end of the outer radial direction OR of the second circumferential boundary 127b is connected to the boundary 128 of the outer radial direction OR of the main extension 121. The boundary 128 of the outer radial direction OR of the main extension 121 may include a shape convexly rounded in the outer radial direction OR.

The end of the inner radial direction IR of the first circumferential boundary 127a is connected to the boundary 129 of the outer radial direction OR of the auxiliary extension 122. The end of the inner radial direction IR of the second circumferential boundary 127b is connected to the boundary 129 of the outer radial direction OR of the auxiliary extension 122. The boundary 129 of the outer radial direction OR of the auxiliary extension 122 may include a concave rounded shape in the inner radial direction IR.

The first circumferential boundary 127a of each of the main extensions 121 extends in the first circumferential direction C1 than the extending direction of the extending reference line Ls adjacent to the second circumferential direction C2 ( Ls). For example, referring to FIG. 7, the first circumferential boundary 127a of the main extension portion 121-1 is the first circumference than the extension direction of the extension reference line Ls1 adjacent to the second circumferential direction C2. It extends in a direction close to the vertical direction of the extending reference line Ls2 adjacent in the direction C1. That is, the first circumferential boundary 127a of the first circumferential boundary 127a of the main extension portion 121-1 is perpendicular to the extending reference line Ls2 than the angle formed by the extending reference line Ls1. The angle with the line is smaller.

The second circumferential boundary 127b of each main extension 121 extends in the second circumferential direction C2 than the extending direction of the extending reference line Ls adjacent to the first circumferential direction C1 ( Ls). For example, referring to FIG. 7, the second circumferential boundary 127b of the main extension portion 121-1 is a second circumference than the extension direction of the extension reference line Ls1 adjacent to the first circumferential direction C1. It extends in a direction close to the vertical direction of the extending reference line Ls5 adjacent to the direction C2. That is, the second circumferential boundary 127b of the second circumferential boundary 127b of the main extension part 121-1 is perpendicular to the extension reference line Ls5 than the angle formed by the extension reference line Ls1. The angle with the line is smaller.

In each of the main extensions 121, the first circumferential boundary 127a forms a first angle Ag1 with an adjacent extension reference line Ls in the second circumferential direction C2, and the second circumferential direction The boundary 127b forms a second angle Ag2 with the extending reference line Ls adjacent in the first circumferential direction. For example, referring to FIG. 7, the first circumferential direction boundary 127a of the main extension part 121-1 extends adjacent to the second circumferential direction C2 with the reference line Ls1 and the first angle Ag1. And the second circumferential boundary 127b of the main extension part 121-1 forms a second angle Ag2 with the extending reference line Ls1 adjacent to the first circumferential direction C1.

The first angle Ag1 and the second angle Ag2 may be the same. The first angle Ag1 may be 10° or more and 60° or less. The second angle Ag2 may be 10° or more and 60° or less.

In each of the main extensions 121, a virtual extension line extending along the first circumferential boundary 127a and a virtual extension line extending along the second circumferential boundary 127b are formed of the wheel hub 10. It can intersect outside the outer radial direction (OR). When viewed in the inner axial direction IA, in each main extension 121, the imaginary extension line of the first circumferential boundary 127a and the imaginary extension line of the second circumferential boundary 127b May intersect outside the outer radial direction (OR) of the outer hub portion 200. In each main extension 121, the imaginary extension line of the first circumferential boundary 127a and the imaginary extension line of the second circumferential boundary 127b will intersect on the corresponding extension reference line Ls. Can be. In FIG. 7, an intersection point P of the imaginary extension line of the first circumferential boundary 127a and the imaginary extension line of the second circumferential boundary 127b is shown.

8 is an enlarged partial sectional view of part E1 of FIG. 5. 9 is an enlarged partial sectional view of part E2 of FIG. 5. 8 and 9, the diameter of the corresponding hole 230h of the outer hub portion 200 may be the smallest at the end of the inner axial direction IA of the corresponding hole 230h. The diameter at the end of the inner axial direction IA of the corresponding hole 230h may be greater than or equal to the diameter at the end of the outer axial direction OA of the fastening hole 120h of the inner hub portion 100. The outer hub part 200 includes a chamfer part 233 configured to gradually increase in diameter in a corresponding hole in the outer axial direction OA. Through this, the part to press the wheel bolt 61 can be made by the inner hub part 100 having relatively high strength, preventing deformation of the holes 120h and 230h, and the wheel bolt 61 and the wheel The coupling force of the hub 10 can be improved. In addition, by forming the chamfer portion 233, when the wheel bolt 61 is pressed, the outer hub portion 200 made of the second material having a relatively low strength by the threads of the wheel bolt 61 is crushed or deformed. Can be prevented.

As an example of a method for manufacturing the chamfer portion 233, after the inner hub portion 100 and the outer hub portion 200 are combined, the holes 120h and 320h are integrally formed using the hole forming apparatus. , The chamfer portion 233 may be formed by shaving the circumferential portion of the corresponding hole 320h. The chamfer part 233 may be disposed on the outer cover part 232. The thickness Ta of the axial directions OA and IA of the outer cover portion 232 may be at least 0.1 mm.

Hereinafter, the inner hub portion 100 and the outer hub portion 200 according to an embodiment will be described with reference to FIGS. 8 and 9. The locking portion 126 according to an embodiment of the flange portion 120 is located at a portion where the outer radial end surface 125 and the inner axial end surface 124 of the flange portion 120 are connected. The end of the outer axial direction OA of the engaging portion 126 is connected to the outer radial end surface 125 of the flange portion 120. The end of the inner axial direction IA of the locking portion 126 is connected to the inner axial end surface 124 of the flange portion 120.

The locking portion 126 forms a surface having a slope in the direction between the inner radial direction IR and the inner axial direction IA. The angle Ag3 formed between the axial directions OA and IA and the inclined direction of the locking portion 126 may be 1° or more and 45° or less. If the angle (Ag3) between the axial direction (OA, IA) and the inclined direction of the locking portion 126 exceeds 45°, it is necessary to make the flange portion 120 cover the locking portion 126 in the forging method described above. It becomes difficult. In addition, if the angle (Ag3) between the axial direction (OA, IA) and the inclined direction of the locking portion 126 is less than 1°, the axial direction (OA, of the inner hub portion 100 and the outer hub portion 200) IA) is weakened. In one embodiment, the angle (Ag3) between the axial direction (OA, IA) and the oblique direction of the locking portion 126 is about 25 degrees.

The axial length Da of the locking portion 126 may be greater than or equal to the radial length Db of the locking portion 126. In one embodiment, the axial length Da is greater than the radial length Db.

The axial length Da of the locking portion 126 may be 1/3 or more of the axial width Dc of the flange portion 120. In one embodiment, the axial length Da is greater than 1/2 of the axial width Dc.

The description of the locking portion 126 described above with reference to FIGS. 8 and 9 may be applied to the first locking portion 126a of FIG. 8 and the second locking portion 126b of FIG. 9, respectively.

10 is a perspective view of an inner hub portion 100 ′ according to another embodiment of the present disclosure. FIG. 11 is a partial cross-sectional view of the inner hub portion 100 ′ of FIG. 10 cut along the portion E3 of FIG. 10 in a state where the outer hub portion 200 ′ is coupled. FIG. 12 is a partial cross-sectional view of the inner hub portion 100 ′ of FIG. 10 cut along the E4 portion of FIG. 10 in a state where the outer hub portion 200 ′ is coupled. Hereinafter, with reference to FIGS. 10 to 12, focusing on the difference between the inner hub portion 100 and the outer hub portion 200 according to the above-described embodiment, the inner hub portion 100' according to another embodiment and The outer hub part 200' will be described.

10 to 12, the locking portion 126 ′ according to another embodiment of the flange portion 120 is provided at a portion where the outer radial end surface 125 and the inner axial end surface 124 are connected. Forms a dust-like shape. The locking portion 126 ′ forms a step in the inner radial direction IR with respect to the outer radial end surface 125 of the flange portion 120. The locking portion 126 ′ forms a step in the outer radial direction OR with respect to the inner axial end surface 124 of the flange portion 120. Through the shape of the locking portion 126' having a step, it is possible to improve the physical coupling force in the axial direction (OA, IA) of the inner hub portion 100 and the outer hub portion 200'.

The engaging portion 126' of the flange portion 120 of the inner hub portion 100' is a first stepped surface spaced apart from the outer radial end surface 125 of the flange portion 120 in the inner radial direction (IR) ( 126P'). The first step surface 126P' is connected to the inner axial end surface 124 of the flange portion 120. The end of the inner axial end IA of the first stepped surface 126P' is connected to the inner axial end face 124.

The locking portion 126' includes a second step surface 126Q' spaced apart from the inner axial end surface 124 of the flange portion 120 in the outer axial direction OA. The second step surface 126Q' is connected to the outer radial end surface 125 of the flange portion 120 and the first step surface 126P'. The end of the inner radial direction IR of the second step surface 126Q' is connected to the end of the outer axial direction OA of the first step surface 126P'. The end of the outer radial end OR of the second stepped surface 126Q' is connected to the outer radial end face 125.

The first stepped surface 126P' includes a surface having a slope in a direction between the inner radial direction IR and the inner axial direction IA. The angle Ag4 between the axial directions OA and IA and the inclined surface of the first stepped surface 126P' may be 1° or more and 45° or less.

The second step surface 126Q' may include a recessed curved surface 126Q1' extending roundly from the end of the outer axial direction OA of the first step surface 126P' to the outer radial direction OR. The radius of curvature of the recessed curved surface 126Q1' may be 0.5 mm or more.

The second step surface 126Q' may include a convex curved surface 126Q2' extending roundly from the end of the inner axial direction IA of the outer radial end surface 125 to the inner radial direction IR. The radius of curvature of the convex curved surface 126Q2' may be 0.5 mm or more. In this embodiment, the end of the outer radial OR of the recessed curved surface 126Q1' is connected to the end of the inner radial IR of the convex curved surface 126Q2'.

The axial length Dd of the locking portion 126' may be greater than or equal to the radial length De of the locking portion 126'. In one embodiment, the axial length Dd is greater than the radial length De.

The axial length Da of the locking portion 126 ′ may be 1/3 or more of the axial width Df of the flange portion 120. In one embodiment, the axial length Da is greater than 1/2 of the axial width Df.

The description of the locking portion 126' described above with reference to FIGS. 11 and 12 may be applied to the first locking portion 126a' of FIG. 11 and the second locking portion 126b' of FIG. 12, respectively. .

In addition, the outer hub portion 200' covers the outer radial direction (OR) portion of the outer axial (OA) surface of the flange portion (120). The outer hub part 200' covers the first stepped surface 126P' and the second stepped surface 126Q'.

13 is a partial cross-sectional view showing a modified example of FIG. 11 and showing an inner hub portion 100 ″ and an outer hub portion 200 ″ according to another embodiment. 14 is a partial cross-sectional view showing a modified example of FIG. 12 and showing an inner hub portion 100 ″ and an outer hub portion 200 ″ according to another embodiment. Hereinafter, with reference to FIGS. 13 and 14, focusing on the difference between the inner hub part 100 ′ and the outer hub part 200 ′ according to another embodiment described above, the inner hub part 100 according to another embodiment will be described. '') and the outer hub part 200'' will be described.

13 and 14, the second step surface 126Q″ of the locking portion 126″ according to another embodiment of the flange portion 120 includes a flat surface 126Q3″. The second step surface 126Q'' may include a depressed curved surface 126Q1'' and a convex curved surface 126Q2''. The flat surface 126Q3'' may extend between the recessed curved surface 126Q1'' and the convex curved surface 126Q2''. Meanwhile, descriptions of the first stepped surface 126P'', the recessed curved surface 126Q1'', and the convex curved surface 126Q2'' are duplicated and omitted from the contents of the locking portion 126' according to another embodiment described above do.

The flat surface 126Q3'' of the second step surface 126Q'' of the locking portion 126'' extends parallel to the outer radial direction OR or inclined at an acute angle with respect to the outer radial direction OR Can be extended. The flat surface 126Q3'' may extend parallel to the outer radial direction OR, or may extend in a direction between the outer radial direction OR and the outer radial direction OR. The angle Ag5 between the axial directions OA and IA and the flat surface 126Q3'' may be 90° or more and 100° or less. In FIG. 13, the angle Ag5 between the imaginary straight line lb parallel to the axial directions OA and IA and the imaginary straight line la parallel to the extending direction of the flat surface 126Q3'' is shown.

Description of the above-described locking portion 126'' with reference to FIGS. 13 and 14 is applied to the first locking portion 126a'' of FIG. 13 and the second locking portion 126b'' of FIG. 14, respectively. can do.

In addition, the outer hub portion 200 ″ covers the outer radial direction (OR) portion of the outer axial (OA) surface of the flange portion 120. The outer hub part 200″ covers the first stepped surface 126P″ and the second stepped surface 126Q″.

15 is a perspective view showing an outer axial (OA) surface of the inner hub portion 100 of FIG. 2, and the rigid reinforcement 150 according to an embodiment is illustrated. 16 is a perspective view showing an outer axial (OA) surface of the inner hub portion 100 of FIG. 2, and a rigid reinforcement 150 ′ according to another embodiment is illustrated. Referring to FIGS. 15 and 16, the rigid reinforcement parts 150 and 150' will be described as follows.

The inner hub portion 100 includes a plurality of rigid reinforcement portions 150 and 150' protruding in the outer axial direction OA and extending in a radial direction (OR, IR). The rigid reinforcement parts 150 and 150' protrude from the surface of the outer axial direction OA of the inner hub part 100. The plurality of rigid reinforcement parts 150 and 150' may be arranged at regular intervals from each other in the circumferential directions C1 and C2.

The number of the plurality of rigid reinforcement parts 150 and 150 ′ may be the same as the number of the plurality of main extension parts 121 or the number of the number of the plurality of main extension parts 121. The term "multiple of the number" referred to herein means a value multiplied by a natural number of 2 or more. Through this, it is possible to prevent the center of gravity of the wheel hub 10 from being tilted to one side about the rotation axis C.

The plurality of rigid reinforcement parts 150 and 150' include a plurality of first rigid reinforcement parts 150A extending in the inner radial direction IR at the positions of the plurality of fastening holes. The first rigid reinforcing portion 150A may be formed in a shape in which the widths of the circumferential directions C1 and C2 decrease as it goes toward the inner axial direction IA.

The plurality of first rigid reinforcement parts 150A correspond to the plurality of main extension parts 121. The plurality of first rigid reinforcement parts 150A correspond to the plurality of extended reference lines Ls. Each first rigid reinforcement 150A extends along the corresponding main extension 121.

On the other hand, the surface of the inner axial direction (IA) of the outer hub portion 200 is formed in a shape that meshes with the shape of the surface of the outer axial direction (OA) of the inner hub portion 100. The surface of the inner axial direction (IA) of the outer hub portion 200 surrounds the surfaces of the plurality of rigid reinforcement portions 150 and 150' of the inner hub portion.

Referring to FIG. 15, the number of the plurality of rigid reinforcement parts 150 according to an embodiment is the same as the number of the plurality of main extension parts 121. The plurality of rigid reinforcement parts 150 include the first rigid reinforcement part 150A, but do not include the second rigid reinforcement part 150B described later.

Referring to FIG. 16, the number of the plurality of rigid reinforcement parts 150 ′ according to another embodiment is the same as a multiple of the number of the plurality of main extension parts 121. In the present embodiment, the number of the plurality of rigid reinforcement parts 150' is equal to twice the number of the plurality of main extension parts 121.

The plurality of rigid reinforcement parts 150' includes a plurality of first rigid reinforcement parts 150A. The plurality of rigid reinforcement parts 150 ′ further includes a plurality of second rigid reinforcement parts 150B disposed between the plurality of first rigid reinforcement parts 150A. The second rigid reinforcement portion 150B extends in the radial direction (OR, IR) across the surface of the outer axial direction OA of the auxiliary extension portion 122. The second rigid reinforcing part 150B may be formed in a shape in which the widths of the circumferential directions C1 and C2 decrease as it goes toward the inner axial direction IA. The length of the radial direction (OR, IR) of the second rigid reinforcement portion 150B is shorter than the length of the radial direction (OR, IR) of the first rigid reinforcement portion 150A.

FIG. 17 is a cross-sectional view of the inner hub portion 100 of FIG. 15 taken along the line S1-S1', and the rigid reinforcement portion 150S1 according to the first embodiment is shown. 18 is a cross-sectional view of the inner hub portion 100 of FIG. 15 taken along the lines S1-S1', and the stiffness reinforcement portion 150S2 according to the second embodiment is shown. Referring to Figures 17 and 18, the cross-sectional shape of the rigid reinforcement (150S1, 150S2) is as follows.

17 and 18, the central portions 151 and 151' of the circumferential directions C1 and C2 of the respective surfaces of the rigid reinforcement parts 150S1 and 150S2 are perpendicular to the outer axial direction OA. It is flat or protrudes roundly in the outer axial direction (OA). The rigid reinforcement parts 150S1 and 150S2 include top parts 151 and 151' forming the central portion of the circumferential directions C1 and C2 of the surface.

The ends of the stiffness reinforcement parts 150S1 and 150S2 in the circumferential directions C1 and C2 of each surface are roundly connected to the surface 120I of the other part of the inner hub part 100. The rigid reinforcement parts 150S1 and 150S2 include base parts 152 and 152' forming the distal ends in the circumferential directions C1 and C2 of the surface. The base portions 152 and 152' form a round recessed surface.

Referring to FIG. 17, the top portion 151 of the rigid reinforcement portion 150S1 according to the first embodiment forms a surface protruding roundly in the outer axial direction OA. The end of the first circumferential direction C1 of the top portion 151 is connected to the first base portion 152a, and the end of the second circumferential direction C2 of the top portion 151 is connected to the second base portion 152b do.

Referring to FIG. 18, the top portion 151 ′ of the rigid reinforcement portion 150S2 according to the second embodiment forms a flat surface perpendicular to the outer axial direction OA. The rigid reinforcement part 150S2 further includes a top connection part 154' connected to both ends of the circumferential directions C1 and C2 of the top part 151'. The top connection 154' forms a roundly protruding surface. The end of the first circumferential direction C1 of the top portion 151' is connected to the first top connection portion 154a', and the end of the second circumferential direction C2 of the top portion 151' is the second top connection portion 154b ').

The rigid reinforcement part 150S2 further includes a side connection part 153' connecting the base parts 152a', 152b' and the top connection part 154'. The first side connection portion 153a' extends while connecting between the first base portion 152a' and the first top connection portion 154a'. The second side connecting portion 153b' extends while connecting between the second base portion 152b' and the second top connecting portion 154b'.

Although the technical spirit of the present disclosure has been described by the examples shown in the accompanying drawings and some embodiments, the technical spirit and scope of the present disclosure can be understood by those skilled in the art to which the present disclosure pertains. It will be appreciated that various substitutions, modifications and changes can be made in the range. In addition, such substitutions, modifications and variations should be considered within the scope of the appended claims.

1: wheel bearing assembly, 10: wheel hub, 15: inner ring, 20: outer ring, 30: rolling member, 100, 100', 100'': inner hub portion, 110: center portion, 120: flange portion, 120h: fastening hole , 121: main extension, 126, 126', 126'': engaging portion, 127: circumferential boundary of the main extension, 150, 150', 150S1, 150S2: rigid reinforcement, 200, 200', 200'' : Outer hub portion, 210: Central counterpart, 230: Cylindrical section, 230h: Counter hole, 233: Chamfer section, Ls: Extended reference line

Claims (22)

An inner hub portion formed of a first material and having a central portion protruding in an inner axial direction and a flange portion extending in an outer radial direction from the central portion; And
It is formed of a second material having a relatively low strength and a relatively small weight compared to the first material, and includes an outer hub part integrally coupled with the inner hub part,
The flange portion is formed to form a plurality of fastening holes which are axially penetrated and spaced apart from each other along the circumferential direction to be fastened with the wheel, and extend virtually outwardly from the rotational axis toward each position of the plurality of fastening holes. And a plurality of main extensions protruding along a plurality of extension reference lines of the
The outer hub portion includes a circumferential portion extending in a circumferential direction connecting the plurality of main extension portions,
Each of the main extensions has a first circumferential boundary and a second circumferential boundary around the corresponding extension reference line,
The boundary of the first circumferential direction extends in a direction between the inner radial direction and the first circumferential direction,
The boundary of the second circumferential direction extends in a direction between the inner radial direction and the second circumferential direction,
Wheel hub. According to claim 1,
Each of the fastening holes is formed in the outer radial portion of the corresponding main extension,
Wheel hub. According to claim 1,
The boundary of the first circumferential direction of each of the main extensions extends in a direction closer to the vertical direction of the extending reference line adjacent to the first circumferential direction than the extending direction of the extending reference line adjacent to the second circumferential direction,
The boundary of the second circumferential direction of each of the main extensions extends in a direction closer to the vertical direction of the extension reference line adjacent in the second circumferential direction than the extension direction of the extension reference line adjacent in the first circumferential direction,
Wheel hub. According to claim 1,
In each of the main extensions, a boundary in the first circumferential direction forms a first angle with the extension reference line adjacent in the second circumferential direction, and a boundary in the second circumferential direction is the extension reference line adjacent in the first circumferential direction. And a second angle,
The first angle and the second angle are the same,
Wheel hub. According to claim 1,
In each of the main extensions, a boundary in the first circumferential direction forms a first angle with the extension reference line adjacent in the second circumferential direction, and a boundary in the second circumferential direction is the extension reference line adjacent in the first circumferential direction. And a second angle,
The first angle is 10˚ or more and 60˚ or less,
The second angle is 10˚ or more and 60˚ or less,
Wheel hub. According to claim 1,
In each of the main extensions, a virtual extension line extending along the first circumferential boundary and a virtual extension line extending along the second circumferential boundary cross outside the outer radial direction of the outer hub portion,
Wheel hub. According to claim 1,
The flange portion,
The outer radial end surface and the inner axial end surface is located in the connecting portion, and includes a locking portion forming a surface having a slope in a direction between the inner radial direction and the inner axial direction,
The outer hub portion covers the outer radial portion of the outer axial surface of the flange portion and the engaging portion,
Wheel hub. The method of claim 7,
The angle between the axial direction and the inclined direction of the engaging portion is 1° or more and 45° or less,
Wheel hub. The method of claim 7,
The axial length of the engaging portion is more than the radial length,
Wheel hub. The method of claim 7,
The axial length of the engaging portion is 1/3 or more of the axial width of the flange portion,
Wheel hub. According to claim 1,
The flange portion,
A first stepped surface spaced apart from the outer radially end face in the inner radial direction and connected to the inner axial end face and the outer radially end face and the first end spaced apart in the outer axial direction from the inner axial end face; It includes a locking portion including a second step surface connected to the vehicle surface,
The outer hub portion covers the outer radial portion of the outer axial surface of the flange portion, the first stepped surface and the second stepped surface,
Wheel hub. The method of claim 11,
The second step surface,
A recessed curved surface extending roundly in the outer radial direction from the outer axial end of the first stepped surface; And
And a convex curved surface extending roundly in the inner radial direction from the inner axial end of the outer radial end surface,
Wheel hub. The method of claim 12,
The second step surface,
Further comprising a flat surface extending between the recessed curved surface and the convex curved surface,
Wheel hub. The method of claim 11,
The first step surface includes a surface having an inclination in the direction between the inner radial direction and the inner axial direction,
Wheel hub. According to claim 1,
The outer hub portion,
The outer axial surface of the plurality of main extensions is covered, and a plurality of corresponding holes penetrated in the axial direction at positions corresponding to the plurality of fastening holes and connected to the fastening holes are formed.
The diameter of the corresponding hole is the smallest at the inner axial end of the corresponding hole,
The diameter at the inner axial end of the corresponding hole is greater than or equal to the diameter at the outer axial end of the fastening hole,
Wheel hub. The method of claim 15,
The outer hub portion,
The chamfer portion is configured to increase in diameter toward the outer axial direction of the corresponding hole,
Wheel hub. According to claim 1,
The inner hub portion includes a plurality of rigid reinforcing portions protruding in the outer axial direction and extending in a radial direction,
The outer hub portion covers the outer axial surface of the inner hub portion,
The plurality of stiffness reinforcement portions include a plurality of first stiffness reinforcements extending in an inner radial direction from the positions of the plurality of fastening holes,
The number of the plurality of rigid reinforcement parts is equal to the number of the plurality of main extension parts, or the same as a multiple of the number of the plurality of main extension parts,
Wheel hub. The method of claim 17,
The circumferential end portion of each surface of the rigid reinforcement portion is roundly connected to the surface of the other portion of the inner hub portion,
Wheel hub. The method of claim 18,
The circumferential center portion of each surface of the rigid reinforcement portion is flat in a direction perpendicular to the outer axial direction, or protrudes roundly in the outer axial direction,
Wheel hub. The method of claim 17,
The plurality of rigid reinforcement,
And a plurality of second rigid reinforcements disposed between the plurality of first rigid reinforcements,
Wheel hub. The method of claim 17,
It is formed in a shape in which the circumferential width decreases toward the inner axial direction,
Wheel hub. paddle;
A wheel hub rotatable relative to the outer ring and configured to rotate integrally with the wheel; And
It includes a rolling member disposed between the outer ring and the wheel hub,
The wheel hub,
An inner hub portion formed of a first material and having a central portion protruding in an inner axial direction and a flange portion extending in an outer radial direction from the central portion; And
It is formed of a second material having a relatively low strength and a relatively small weight compared to the first material, and includes an outer hub part integrally coupled with the inner hub part,
The flange portion forms a plurality of fastening holes which are axially penetrated and are spaced apart from each other along the circumferential direction to be fastened with the wheel, and extend in an outer radial direction from the rotating shaft toward each of the plurality of fastening holes. And a plurality of main extensions extending and projecting along a plurality of virtual extension reference lines,
The outer hub portion includes a circumferential portion extending in a circumferential direction connecting the plurality of main extension portions,
Each of the main extensions has a first circumferential boundary and a second circumferential boundary around the corresponding extension reference line,
The first circumferential boundary extends in the direction between the inner radial direction and the first circumferential direction,
The boundary of the second circumferential direction extends in a direction between the inner radial direction and the second circumferential direction,
Wheel bearing assembly.

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